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Here is a look at the some of the deadliest attacks in Iraq since the withdrawal of U.S. troops on Dec. 18, 2011:
—May 27, 2013: A wave of car bombings tears through mostly Shiite Muslim neighborhoods of the Baghdad area, leaving at least 66 people dead.
—May 21, 2013: Car bombing at a Sunni mosque kills at least 20 people.
—May 20, 2013: A wave of attacks, some at markets and in rush hour crowds, kills 113 people in Shiite and Sunni areas.
—May 17, 2013: Bombs rip through Sunni areas in Baghdad and surrounding areas, killing at least 76 people.
—May 16, 2013: Car bombs hit Shiite neighborhoods in Baghdad and attacks elsewhere in the country leave 21 people dead.
—May 15, 2013: A car bomb goes off near a bus station in Baghdad's main Shiite district, the deadliest of explosions that killed at least 33 people nationwide.
—April 29, 2013: A wave of car bomb blasts tears through Shiite areas south of Baghdad, killing at least 36.
—April 25, 2013: More than 40 people are reported killed in fighting in the key northern city of Mosul.
—April 24, 2013: Clashes between the army and armed Sunni tribesmen who sealed off a central Iraqi town kill 22 people.
—April 23, 2013: Security forces storm a Sunni protest camp in the north, sparking deadly clashes in several towns, which combined with other attacks leave 56 people dead.
—April 18, 2013: A suicide bomber detonated explosives at a Baghdad cafe crowded with young people, killing 32 people.
—April 15, 2013: At least 36 are killed in string of attacks across the country ahead of provincial elections.
—April 6, 2013: A suicide bomber blows himself up at a lunch hosted by a Sunni candidate ahead of regional elections, killing 20 people.
—Mar. 19, 2013: Insurgents carry out a wave of bombings that kills at least 65 people on the eve of the 10th anniversary of the U.S.-led invasion. An al-Qaida in Iraq front group claims responsibility.
—Mar. 14, 2013: Militants unleash a carefully planned assault on the Justice Ministry, killing 30.
—Mar. 4, 2013: Gunmen attack a convoy of Syrian soldiers who had crossed into Iraq for refuge, killing 48.
—Feb. 17, 2013: Car bombs tear through shopping areas in Shiite neighborhoods in Baghdad, killing at least 37.
—Jan. 23, 2013: A suicide bomber strikes a packed funeral ceremony at a Shiite mosque in northern Iraq, killing at least 25.
—Jan. 17, 2013: Insurgents unleash a string of bomb attacks mainly targeting Shiite Muslim pilgrims across Iraq, killing at least 26.
—Jan. 16, 2013: A wave of bombings against the offices of a major Kurdish party and Kurdish security forces headquarters in Kirkuk province kills at least 33.
—Nov. 27, 2012: Insurgents launch attacks against Shiite mosques, security forces, and other targets in central and northern Iraq, killing at least 30.
—Nov. 6, 2012: A suicide bomber detonates his explosives-laden car near a military base north of Baghdad, killing at least 33.
—Sept. 9, 2012: Insurgents gun down soldiers at an army post, bomb police recruits waiting in line to apply for jobs, and stage other attacks that kill 92.
—Aug. 16, 2012: A blistering string of bombings and shootings across the country kills at least 93.
—July 23, 2012: Attacks aimed largely at security forces kill 115 in the country's deadliest single day in two years.
—July 3, 2012: Bombs pound six cities and towns, killing some 40 and raising suspicion that security forces may be assisting attacks on Shiites.
—June 13, 2012: Car bombs target an annual Shiite pilgrimage, killing 72 people in 16 separate explosions.
—April 19, 2012: Bombs rip through 10 Iraqi cities, killing at least 30 and shattering a month of relative calm. Al-Qaida later says the attacks aimed to punish the Shiite-led government and its allies.
—March 20, 2012: Insurgents bent on derailing an Arab League meeting in Baghdad kill 46 in attacks on Shiite pilgrims in the holy city of Karbala, bombings in Kirkuk, and strikes on security and government officials around the country.
—Feb. 23, 2012: Attackers kill at least 55 as car bombs go off near an elementary school in the town of Musayyib, a restaurant in a Shiite neighborhood in Baghdad, and various checkpoints and secure areas.
—Jan. 28, 2012: A suicide car bomber strikes a Shiite funeral procession, killing 33 in southwestern Baghdad.
—Jan. 14, 2012: A bomb tears through a procession of Shiite pilgrims in southern Iraq, killing at least 53.
—Jan. 5, 2012: Coordinated bombings target Shiite Muslims, killing 78 in Baghdad and near the southern city of Nasiriyah, just days before a Shiite holy day.
—Dec. 22, 2011: Attackers hit markets, cafes and government buildings in mostly Shiite neighborhoods of Baghdad, killing 69 people.
Another 2,000 elite Hizballah combatants poured into Syria from Lebanon to augment the 5,000-6,000 already present there, the new arrivals were transferred straight to the battlefront in south Damascus. Rebel forces report they are under assault by a combined force of Lebanese Hizballah and Iraqi Shiite fighters.